package com.hyq.interpreter.demo;

public abstract class SymbolExpression extends Expression {
	protected Expression left;
	protected Expression right;

	// 所有的解析公式都应只关心自己左右两个表达式的结果
	public SymbolExpression(Expression _left, Expression _right) {
		this.left = _left;
		this.right = _right;
	}
}
